Sansui 4005 wont recognize DVD-RW media

I just insert them and i get and error ,after a lot of time trying to read the disc Incorrect disc C-104.

Now this disk are DVD-RW all the way!! and the specs are 1.1v so is compatible with the player. Why it wont recognize them?? these are Samsung Pleomax DVD-RW 4X 120 Min/4.7 GB. Besides that it reads the DVD-R and records them , hell it evens reads burned DVD+R and DVD+RW , but it wont recognize the DVD-RW . Any ideas anyone????